
It’s pretty annoying to see the warning dialog prompted every now and then, and some more it delays the completion of device driver installation, in some cases wasting time when users forget to monitor the progress and leave the installation to run on its way, stopping at unsigned driver dialog indefinitely waiting for user input. The warning message basically reminds users that the hardware device driver or software that being installed has not passed Windows Logo testing to verify its compatibility with Windows XP, and users can click on Continue Anyway to force install the uncertified drivers, or STOP Installation to terminate the installation process. The unsigned non-WHQL compliant driver, meanwhile, will pop up and prompt a warning dialog window.

CAT) is given to a device driver after developers successfully completed HCT (Hardware Compatibility Tests), and included into the downloadable driver package. WHQL (Windows Hardware Quality Labs) secure signature (file in. In Windows XP, a WHQL-signed driver installs smoothly without any warning messages.
